suggests a

grazing diet (gr


, while some of those

same animals at the warmer inte?/h2>

imens that are millions of years old. To find these signatures, researchers run samples of tooth enamel th▓rough a mass spectrometer.DeSantis and her collaborat▓ors analyzed enamel samples from 115fossil teeth.


For two o▓f the specimens she took serial samples, small samples t▓hat run perpendicular to the growth axis and give insight ▓into how the d

site became

mixed feeders th

at also grazed


on grasse

iet and climate changed over a specifi▓c period of time."That's one of the cool things about using▓ mammal

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s. Incre

ased consump

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iew. ?/h4>


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tion of

grasses by m

ixed fe▓ede

teeth," she said. "We can actually look at how va▓riable the climate was within a year, millions of years

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rs and eleph

ago.▓"The study highlights the importance of the fossil record in understanding long-term ecological resp



indicates F
  • lorida's gra
  • sslands likely
  • expanded during i


hoto)?/h2> h enamel loc

  • ks in the chem
  • ical signature
  • s of the▓ plant

animal consumes

, allowi

ng paleonto?/small>
  • 坙ogists to un
  • derstand the die
  • ts and associate

stries. 銆€?/h2>

onses to changes over time, DeSantis said. While ecological studies of modern impacts can cover only lim